#include <iostream>
#include <algorithm>
#include <vector>
#include <string>

int main() {
	int h, m;
	scanf("%d:%d", &h, &m);
	m += 5;
	if (m >= 60) {
		h++;
		m %= 60;
	}
	h %= 24;
	printf("%02d:%02d", h, m);
}